404 Error for non-existant site collections in a wild card managed

We have a Web Application that contains a wildcard managed path,under which we have multiple site collections defined. A few of ourusers have noted that if they incorrectly type in a site name, theyare presented with the following 404 error:

We have a custom 404 page in the 12 hive and have registerred it withthe SPWebApplication object. Users who type in invalid urls at anyother level than the wildcard path are correctly presented the customerror page. Users who type in invalid urls at the managed path levelare presented with the above error.

I have been unable to find much information about this scenario outthere, other than a few blog posts that mention the page registerredwith the SPWebApplication willl not work in this scenario. Is thereany way for us to display our custom error page instead of the aboveerror?

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